Several things got me to post about this topic, including Mark 1101's questions about my Quarter Pie bass horns, which are an MWM derivative.
When I first owned 4 MWMs bin in Nov. 2007, they came with different woofers in them. I had 2 Gauss and 2 K43's. Even though the Gauss could handle the most power, I thought they sounded and measured the worst, so I sold them, which temporarily left 2 empty MWMs bins. The remaining K-43's, had a 55 Hz. peak, which has been observed by others in the High Efficiency Speaker community.
Gary Gillum, long retired, was Chief Engineer at Klipsch in the 70's and 80's. He designed the famous Kg2 and Kg4 speakers (PWK himself told me that the KG2 was "KG squared" which stood for Gary's initials. In any case, Gary is the co-patent holder with Paul Klipsch on the design of the MWM woofer bin, which is still in production as the "top of the line" THX rated, all horn Theater System, modified by current chief Engineer, Roy Delgado. I and several other people here, feel this is the best speaker system that Klipsch makes. It's a monster with no equal, and now that there is a new Horn Loaded Sub available, the world's Movie theaters will see an improvement in their LFE channels, but I digress
I called Gary at his home to interview him. He went through the development process of the MWM, based on Paul's ideas, and he assured me that the MWM was designed with and for the K-33 woofer, which was the exact same woofer used in the Khorn, Belle, LaScala, and Cornwall speakers at the time (mid-70's). He assured me that the ONLY reason they added a K-43 was STRICTLY for power handling and NOT better performance. The curve in the patent itself is based on the K-33 woofer, even though all of the production MWM and MWMs woofer sections all shipped with K-43 woofers as standard.
After my conversation with Gary, I took a pair of K-33 woofers from my LaScalas and put them in the 2 empty MWMs bins. I measured and listened. I noticed right away that the bass seemed deeper and fuller. After this observation, I advised Mark1101 to put either K-33 or Crites woofers in his 4 MWMs bins, which he still has today.
From prior posts, I had saved James Cullison's Hornresp model of the MWM, which, I believe, was done with a K-43 specification. I changed the throat area to a more accurate figure, then substituted the T/S specs of a K-33 and this is what I got in Hornresp. Looks like this modern simulation agrees with what I heard 6 years ago. Hope you all find this interesting and helps to prove that the K-33 is the better woofer to use in a MWM for home use.
Edited by ClaudeJ1, 27 February 2014 - 08:48 PM.